git.squeep.com Git - akkoma/blob - lib/pleroma/web/activity_pub/activity_pub.ex

   1 defmodule Pleroma.Web.ActivityPub.ActivityPub do
   2   alias Pleroma.{Activity, Repo, Object, Upload, User, Notification}
   3   alias Pleroma.Web.ActivityPub.{Transmogrifier, MRF}
   4   alias Pleroma.Web.WebFinger
   5   alias Pleroma.Web.Federator
   6   alias Pleroma.Web.OStatus
   7   import Ecto.Query
   8   import Pleroma.Web.ActivityPub.Utils
   9   require Logger
  10
  11   @httpoison Application.get_env(:pleroma, :httpoison)
  12
  13   @instance Application.get_env(:pleroma, :instance)
  14
  15   # For Announce activities, we filter the recipients based on following status for any actors
  16   # that match actual users.  See issue #164 for more information about why this is necessary.
  17   def get_recipients(%{"type" => "Announce"} = data) do
  18     recipients = (data["to"] || []) ++ (data["cc"] || [])
  19     actor = User.get_cached_by_ap_id(data["actor"])
  20
  21     recipients
  22     |> Enum.filter(fn recipient ->
  23       case User.get_cached_by_ap_id(recipient) do
  24         nil ->
  25           true
  26
  27         user ->
  28           User.following?(user, actor)
  29       end
  30     end)
  31   end
  32
  33   def get_recipients(data) do
  34     (data["to"] || []) ++ (data["cc"] || [])
  35   end
  36
  37   defp check_actor_is_active(actor) do
  38     if not is_nil(actor) do
  39       with user <- User.get_cached_by_ap_id(actor),
  40            nil <- user.info["deactivated"] do
  41         :ok
  42       else
  43         _e -> :reject
  44       end
  45     else
  46       :ok
  47     end
  48   end
  49
  50   def insert(map, local \\ true) when is_map(map) do
  51     with nil <- Activity.get_by_ap_id(map["id"]),
  52          map <- lazy_put_activity_defaults(map),
  53          :ok <- check_actor_is_active(map["actor"]),
  54          {:ok, map} <- MRF.filter(map),
  55          :ok <- insert_full_object(map) do
  56       {:ok, activity} =
  57         Repo.insert(%Activity{
  58           data: map,
  59           local: local,
  60           actor: map["actor"],
  61           recipients: get_recipients(map)
  62         })
  63
  64       Notification.create_notifications(activity)
  65       stream_out(activity)
  66       {:ok, activity}
  67     else
  68       %Activity{} = activity -> {:ok, activity}
  69       error -> {:error, error}
  70     end
  71   end
  72
  73   def stream_out(activity) do
  74     public = "https://www.w3.org/ns/activitystreams#Public"
  75
  76     if activity.data["type"] in ["Create", "Announce"] do
  77       Pleroma.Web.Streamer.stream("user", activity)
  78       Pleroma.Web.Streamer.stream("list", activity)
  79
  80       if Enum.member?(activity.data["to"], public) do
  81         Pleroma.Web.Streamer.stream("public", activity)
  82
  83         if activity.local do
  84           Pleroma.Web.Streamer.stream("public:local", activity)
  85         end
  86       else
  87         if !Enum.member?(activity.data["cc"] || [], public) &&
  88              !Enum.member?(
  89                activity.data["to"],
  90                User.get_by_ap_id(activity.data["actor"]).follower_address
  91              ),
  92            do: Pleroma.Web.Streamer.stream("direct", activity)
  93       end
  94     end
  95   end
  96
  97   def create(%{to: to, actor: actor, context: context, object: object} = params) do
  98     additional = params[:additional] || %{}
  99     # only accept false as false value
 100     local = !(params[:local] == false)
 101     published = params[:published]
 102
 103     with create_data <-
 104            make_create_data(
 105              %{to: to, actor: actor, published: published, context: context, object: object},
 106              additional
 107            ),
 108          {:ok, activity} <- insert(create_data, local),
 109          :ok <- maybe_federate(activity),
 110          {:ok, _actor} <- User.increase_note_count(actor) do
 111       {:ok, activity}
 112     end
 113   end
 114
 115   def accept(%{to: to, actor: actor, object: object} = params) do
 116     # only accept false as false value
 117     local = !(params[:local] == false)
 118
 119     with data <- %{"to" => to, "type" => "Accept", "actor" => actor, "object" => object},
 120          {:ok, activity} <- insert(data, local),
 121          :ok <- maybe_federate(activity) do
 122       {:ok, activity}
 123     end
 124   end
 125
 126   def reject(%{to: to, actor: actor, object: object} = params) do
 127     # only accept false as false value
 128     local = !(params[:local] == false)
 129
 130     with data <- %{"to" => to, "type" => "Reject", "actor" => actor, "object" => object},
 131          {:ok, activity} <- insert(data, local),
 132          :ok <- maybe_federate(activity) do
 133       {:ok, activity}
 134     end
 135   end
 136
 137   def update(%{to: to, cc: cc, actor: actor, object: object} = params) do
 138     # only accept false as false value
 139     local = !(params[:local] == false)
 140
 141     with data <- %{
 142            "to" => to,
 143            "cc" => cc,
 144            "type" => "Update",
 145            "actor" => actor,
 146            "object" => object
 147          },
 148          {:ok, activity} <- insert(data, local),
 149          :ok <- maybe_federate(activity) do
 150       {:ok, activity}
 151     end
 152   end
 153
 154   # TODO: This is weird, maybe we shouldn't check here if we can make the activity.
 155   def like(
 156         %User{ap_id: ap_id} = user,
 157         %Object{data: %{"id" => _}} = object,
 158         activity_id \\ nil,
 159         local \\ true
 160       ) do
 161     with nil <- get_existing_like(ap_id, object),
 162          like_data <- make_like_data(user, object, activity_id),
 163          {:ok, activity} <- insert(like_data, local),
 164          {:ok, object} <- add_like_to_object(activity, object),
 165          :ok <- maybe_federate(activity) do
 166       {:ok, activity, object}
 167     else
 168       %Activity{} = activity -> {:ok, activity, object}
 169       error -> {:error, error}
 170     end
 171   end
 172
 173   def unlike(
 174         %User{} = actor,
 175         %Object{} = object,
 176         activity_id \\ nil,
 177         local \\ true
 178       ) do
 179     with %Activity{} = like_activity <- get_existing_like(actor.ap_id, object),
 180          unlike_data <- make_unlike_data(actor, like_activity, activity_id),
 181          {:ok, unlike_activity} <- insert(unlike_data, local),
 182          {:ok, _activity} <- Repo.delete(like_activity),
 183          {:ok, object} <- remove_like_from_object(like_activity, object),
 184          :ok <- maybe_federate(unlike_activity) do
 185       {:ok, unlike_activity, like_activity, object}
 186     else
 187       _e -> {:ok, object}
 188     end
 189   end
 190
 191   def announce(
 192         %User{ap_id: _} = user,
 193         %Object{data: %{"id" => _}} = object,
 194         activity_id \\ nil,
 195         local \\ true
 196       ) do
 197     with true <- is_public?(object),
 198          announce_data <- make_announce_data(user, object, activity_id),
 199          {:ok, activity} <- insert(announce_data, local),
 200          {:ok, object} <- add_announce_to_object(activity, object),
 201          :ok <- maybe_federate(activity) do
 202       {:ok, activity, object}
 203     else
 204       error -> {:error, error}
 205     end
 206   end
 207
 208   def unannounce(
 209         %User{} = actor,
 210         %Object{} = object,
 211         activity_id \\ nil,
 212         local \\ true
 213       ) do
 214     with %Activity{} = announce_activity <- get_existing_announce(actor.ap_id, object),
 215          unannounce_data <- make_unannounce_data(actor, announce_activity, activity_id),
 216          {:ok, unannounce_activity} <- insert(unannounce_data, local),
 217          :ok <- maybe_federate(unannounce_activity),
 218          {:ok, _activity} <- Repo.delete(announce_activity),
 219          {:ok, object} <- remove_announce_from_object(announce_activity, object) do
 220       {:ok, unannounce_activity, object}
 221     else
 222       _e -> {:ok, object}
 223     end
 224   end
 225
 226   def follow(follower, followed, activity_id \\ nil, local \\ true) do
 227     with data <- make_follow_data(follower, followed, activity_id),
 228          {:ok, activity} <- insert(data, local),
 229          :ok <- maybe_federate(activity) do
 230       {:ok, activity}
 231     end
 232   end
 233
 234   def unfollow(follower, followed, activity_id \\ nil, local \\ true) do
 235     with %Activity{} = follow_activity <- fetch_latest_follow(follower, followed),
 236          {:ok, follow_activity} <- update_follow_state(follow_activity, "cancelled"),
 237          unfollow_data <- make_unfollow_data(follower, followed, follow_activity, activity_id),
 238          {:ok, activity} <- insert(unfollow_data, local),
 239          :ok <- maybe_federate(activity) do
 240       {:ok, activity}
 241     end
 242   end
 243
 244   def delete(%Object{data: %{"id" => id, "actor" => actor}} = object, local \\ true) do
 245     user = User.get_cached_by_ap_id(actor)
 246
 247     data = %{
 248       "type" => "Delete",
 249       "actor" => actor,
 250       "object" => id,
 251       "to" => [user.follower_address, "https://www.w3.org/ns/activitystreams#Public"]
 252     }
 253
 254     with Repo.delete(object),
 255          Repo.delete_all(Activity.all_non_create_by_object_ap_id_q(id)),
 256          {:ok, activity} <- insert(data, local),
 257          :ok <- maybe_federate(activity),
 258          {:ok, _actor} <- User.decrease_note_count(user) do
 259       {:ok, activity}
 260     end
 261   end
 262
 263   def block(blocker, blocked, activity_id \\ nil, local \\ true) do
 264     follow_activity = fetch_latest_follow(blocker, blocked)
 265
 266     if follow_activity do
 267       unfollow(blocker, blocked, nil, local)
 268     end
 269
 270     with block_data <- make_block_data(blocker, blocked, activity_id),
 271          {:ok, activity} <- insert(block_data, local),
 272          :ok <- maybe_federate(activity) do
 273       {:ok, activity}
 274     end
 275   end
 276
 277   def unblock(blocker, blocked, activity_id \\ nil, local \\ true) do
 278     with %Activity{} = block_activity <- fetch_latest_block(blocker, blocked),
 279          unblock_data <- make_unblock_data(blocker, blocked, block_activity, activity_id),
 280          {:ok, activity} <- insert(unblock_data, local),
 281          :ok <- maybe_federate(activity) do
 282       {:ok, activity}
 283     end
 284   end
 285
 286   def fetch_activities_for_context(context, opts \\ %{}) do
 287     public = ["https://www.w3.org/ns/activitystreams#Public"]
 288
 289     recipients =
 290       if opts["user"], do: [opts["user"].ap_id | opts["user"].following] ++ public, else: public
 291
 292     query = from(activity in Activity)
 293
 294     query =
 295       query
 296       |> restrict_blocked(opts)
 297       |> restrict_recipients(recipients, opts["user"])
 298
 299     query =
 300       from(
 301         activity in query,
 302         where:
 303           fragment(
 304             "?->>'type' = ? and ?->>'context' = ?",
 305             activity.data,
 306             "Create",
 307             activity.data,
 308             ^context
 309           ),
 310         order_by: [desc: :id]
 311       )
 312
 313     Repo.all(query)
 314   end
 315
 316   def fetch_public_activities(opts \\ %{}) do
 317     q = fetch_activities_query(["https://www.w3.org/ns/activitystreams#Public"], opts)
 318
 319     q
 320     |> restrict_unlisted()
 321     |> Repo.all()
 322     |> Enum.reverse()
 323   end
 324
 325   @valid_visibilities ~w[direct unlisted public private]
 326
 327   defp restrict_visibility(query, %{visibility: "direct"}) do
 328     public = "https://www.w3.org/ns/activitystreams#Public"
 329
 330     from(
 331       activity in query,
 332       join: sender in User,
 333       on: sender.ap_id == activity.actor,
 334       # Are non-direct statuses with no to/cc possible?
 335       where:
 336         fragment(
 337           "not (? && ?)",
 338           [^public, sender.follower_address],
 339           activity.recipients
 340         )
 341     )
 342   end
 343
 344   defp restrict_visibility(_query, %{visibility: visibility})
 345        when visibility not in @valid_visibilities do
 346     Logger.error("Could not restrict visibility to #{visibility}")
 347   end
 348
 349   defp restrict_visibility(query, _visibility), do: query
 350
 351   def fetch_user_activities(user, reading_user, params \\ %{}) do
 352     params =
 353       params
 354       |> Map.put("type", ["Create", "Announce"])
 355       |> Map.put("actor_id", user.ap_id)
 356       |> Map.put("whole_db", true)
 357
 358     recipients =
 359       if reading_user do
 360         ["https://www.w3.org/ns/activitystreams#Public"] ++
 361           [reading_user.ap_id | reading_user.following]
 362       else
 363         ["https://www.w3.org/ns/activitystreams#Public"]
 364       end
 365
 366     fetch_activities(recipients, params)
 367     |> Enum.reverse()
 368   end
 369
 370   defp restrict_since(query, %{"since_id" => since_id}) do
 371     from(activity in query, where: activity.id > ^since_id)
 372   end
 373
 374   defp restrict_since(query, _), do: query
 375
 376   defp restrict_tag(query, %{"tag" => tag}) do
 377     from(
 378       activity in query,
 379       where: fragment("? <@ (? #> '{\"object\",\"tag\"}')", ^tag, activity.data)
 380     )
 381   end
 382
 383   defp restrict_tag(query, _), do: query
 384
 385   defp restrict_recipients(query, [], _user), do: query
 386
 387   defp restrict_recipients(query, recipients, nil) do
 388     from(activity in query, where: fragment("? && ?", ^recipients, activity.recipients))
 389   end
 390
 391   defp restrict_recipients(query, recipients, user) do
 392     from(
 393       activity in query,
 394       where: fragment("? && ?", ^recipients, activity.recipients),
 395       or_where: activity.actor == ^user.ap_id
 396     )
 397   end
 398
 399   defp restrict_limit(query, %{"limit" => limit}) do
 400     from(activity in query, limit: ^limit)
 401   end
 402
 403   defp restrict_limit(query, _), do: query
 404
 405   defp restrict_local(query, %{"local_only" => true}) do
 406     from(activity in query, where: activity.local == true)
 407   end
 408
 409   defp restrict_local(query, _), do: query
 410
 411   defp restrict_max(query, %{"max_id" => max_id}) do
 412     from(activity in query, where: activity.id < ^max_id)
 413   end
 414
 415   defp restrict_max(query, _), do: query
 416
 417   defp restrict_actor(query, %{"actor_id" => actor_id}) do
 418     from(activity in query, where: activity.actor == ^actor_id)
 419   end
 420
 421   defp restrict_actor(query, _), do: query
 422
 423   defp restrict_type(query, %{"type" => type}) when is_binary(type) do
 424     restrict_type(query, %{"type" => [type]})
 425   end
 426
 427   defp restrict_type(query, %{"type" => type}) do
 428     from(activity in query, where: fragment("?->>'type' = ANY(?)", activity.data, ^type))
 429   end
 430
 431   defp restrict_type(query, _), do: query
 432
 433   defp restrict_favorited_by(query, %{"favorited_by" => ap_id}) do
 434     from(
 435       activity in query,
 436       where: fragment("? <@ (? #> '{\"object\",\"likes\"}')", ^ap_id, activity.data)
 437     )
 438   end
 439
 440   defp restrict_favorited_by(query, _), do: query
 441
 442   defp restrict_media(query, %{"only_media" => val}) when val == "true" or val == "1" do
 443     from(
 444       activity in query,
 445       where: fragment("not (? #> '{\"object\",\"attachment\"}' = ?)", activity.data, ^[])
 446     )
 447   end
 448
 449   defp restrict_media(query, _), do: query
 450
 451   # Only search through last 100_000 activities by default
 452   defp restrict_recent(query, %{"whole_db" => true}), do: query
 453
 454   defp restrict_recent(query, _) do
 455     since = (Repo.aggregate(Activity, :max, :id) || 0) - 100_000
 456
 457     from(activity in query, where: activity.id > ^since)
 458   end
 459
 460   defp restrict_blocked(query, %{"blocking_user" => %User{info: info}}) do
 461     blocks = info["blocks"] || []
 462     domain_blocks = info["domain_blocks"] || []
 463
 464     from(
 465       activity in query,
 466       where: fragment("not (? = ANY(?))", activity.actor, ^blocks),
 467       where: fragment("not (?->'to' \\?| ?)", activity.data, ^blocks),
 468       where: fragment("not (split_part(?, '/', 3) = ANY(?))", activity.actor, ^domain_blocks)
 469     )
 470   end
 471
 472   defp restrict_blocked(query, _), do: query
 473
 474   defp restrict_unlisted(query) do
 475     from(
 476       activity in query,
 477       where:
 478         fragment(
 479           "not (coalesce(?->'cc', '{}'::jsonb) \\?| ?)",
 480           activity.data,
 481           ^["https://www.w3.org/ns/activitystreams#Public"]
 482         )
 483     )
 484   end
 485
 486   def fetch_activities_query(recipients, opts \\ %{}) do
 487     base_query =
 488       from(
 489         activity in Activity,
 490         limit: 20,
 491         order_by: [fragment("? desc nulls last", activity.id)]
 492       )
 493
 494     base_query
 495     |> restrict_recipients(recipients, opts["user"])
 496     |> restrict_tag(opts)
 497     |> restrict_since(opts)
 498     |> restrict_local(opts)
 499     |> restrict_limit(opts)
 500     |> restrict_max(opts)
 501     |> restrict_actor(opts)
 502     |> restrict_type(opts)
 503     |> restrict_favorited_by(opts)
 504     |> restrict_recent(opts)
 505     |> restrict_blocked(opts)
 506     |> restrict_media(opts)
 507     |> restrict_visibility(opts)
 508   end
 509
 510   def fetch_activities(recipients, opts \\ %{}) do
 511     fetch_activities_query(recipients, opts)
 512     |> Repo.all()
 513     |> Enum.reverse()
 514   end
 515
 516   def upload(file) do
 517     data = Upload.store(file, Application.get_env(:pleroma, :instance)[:dedupe_media])
 518     Repo.insert(%Object{data: data})
 519   end
 520
 521   def user_data_from_user_object(data) do
 522     avatar =
 523       data["icon"]["url"] &&
 524         %{
 525           "type" => "Image",
 526           "url" => [%{"href" => data["icon"]["url"]}]
 527         }
 528
 529     banner =
 530       data["image"]["url"] &&
 531         %{
 532           "type" => "Image",
 533           "url" => [%{"href" => data["image"]["url"]}]
 534         }
 535
 536     locked = data["manuallyApprovesFollowers"] || false
 537     data = Transmogrifier.maybe_fix_user_object(data)
 538
 539     user_data = %{
 540       ap_id: data["id"],
 541       info: %{
 542         "ap_enabled" => true,
 543         "source_data" => data,
 544         "banner" => banner,
 545         "locked" => locked
 546       },
 547       avatar: avatar,
 548       nickname: "#{data["preferredUsername"]}@#{URI.parse(data["id"]).host}",
 549       name: data["name"],
 550       follower_address: data["followers"],
 551       bio: data["summary"]
 552     }
 553
 554     {:ok, user_data}
 555   end
 556
 557   def fetch_and_prepare_user_from_ap_id(ap_id) do
 558     with {:ok, %{status_code: 200, body: body}} <-
 559            @httpoison.get(ap_id, Accept: "application/activity+json"),
 560          {:ok, data} <- Jason.decode(body) do
 561       user_data_from_user_object(data)
 562     else
 563       e -> Logger.error("Could not decode user at fetch #{ap_id}, #{inspect(e)}")
 564     end
 565   end
 566
 567   def make_user_from_ap_id(ap_id) do
 568     if _user = User.get_by_ap_id(ap_id) do
 569       Transmogrifier.upgrade_user_from_ap_id(ap_id)
 570     else
 571       with {:ok, data} <- fetch_and_prepare_user_from_ap_id(ap_id) do
 572         User.insert_or_update_user(data)
 573       else
 574         e -> {:error, e}
 575       end
 576     end
 577   end
 578
 579   def make_user_from_nickname(nickname) do
 580     with {:ok, %{"ap_id" => ap_id}} when not is_nil(ap_id) <- WebFinger.finger(nickname) do
 581       make_user_from_ap_id(ap_id)
 582     else
 583       _e -> {:error, "No AP id in WebFinger"}
 584     end
 585   end
 586
 587   @quarantined_instances Keyword.get(@instance, :quarantined_instances, [])
 588
 589   def should_federate?(inbox, public) do
 590     if public do
 591       true
 592     else
 593       inbox_info = URI.parse(inbox)
 594       inbox_info.host not in @quarantined_instances
 595     end
 596   end
 597
 598   def publish(actor, activity) do
 599     followers =
 600       if actor.follower_address in activity.recipients do
 601         {:ok, followers} = User.get_followers(actor)
 602         followers |> Enum.filter(&(!&1.local))
 603       else
 604         []
 605       end
 606
 607     public = is_public?(activity)
 608
 609     remote_inboxes =
 610       (Pleroma.Web.Salmon.remote_users(activity) ++ followers)
 611       |> Enum.filter(fn user -> User.ap_enabled?(user) end)
 612       |> Enum.map(fn %{info: %{"source_data" => data}} ->
 613         (data["endpoints"] && data["endpoints"]["sharedInbox"]) || data["inbox"]
 614       end)
 615       |> Enum.uniq()
 616       |> Enum.filter(fn inbox -> should_federate?(inbox, public) end)
 617
 618     {:ok, data} = Transmogrifier.prepare_outgoing(activity.data)
 619     json = Jason.encode!(data)
 620
 621     Enum.each(remote_inboxes, fn inbox ->
 622       Federator.enqueue(:publish_single_ap, %{
 623         inbox: inbox,
 624         json: json,
 625         actor: actor,
 626         id: activity.data["id"]
 627       })
 628     end)
 629   end
 630
 631   def publish_one(%{inbox: inbox, json: json, actor: actor, id: id}) do
 632     Logger.info("Federating #{id} to #{inbox}")
 633     host = URI.parse(inbox).host
 634
 635     signature =
 636       Pleroma.Web.HTTPSignatures.sign(actor, %{host: host, "content-length": byte_size(json)})
 637
 638     @httpoison.post(
 639       inbox,
 640       json,
 641       [{"Content-Type", "application/activity+json"}, {"signature", signature}],
 642       hackney: [pool: :default]
 643     )
 644   end
 645
 646   # TODO:
 647   # This will create a Create activity, which we need internally at the moment.
 648   def fetch_object_from_id(id) do
 649     if object = Object.get_cached_by_ap_id(id) do
 650       {:ok, object}
 651     else
 652       Logger.info("Fetching #{id} via AP")
 653
 654       with true <- String.starts_with?(id, "http"),
 655            {:ok, %{body: body, status_code: code}} when code in 200..299 <-
 656              @httpoison.get(
 657                id,
 658                [Accept: "application/activity+json"],
 659                follow_redirect: true,
 660                timeout: 10000,
 661                recv_timeout: 20000
 662              ),
 663            {:ok, data} <- Jason.decode(body),
 664            nil <- Object.get_by_ap_id(data["id"]),
 665            params <- %{
 666              "type" => "Create",
 667              "to" => data["to"],
 668              "cc" => data["cc"],
 669              "actor" => data["attributedTo"],
 670              "object" => data
 671            },
 672            {:ok, activity} <- Transmogrifier.handle_incoming(params) do
 673         {:ok, Object.get_by_ap_id(activity.data["object"]["id"])}
 674       else
 675         object = %Object{} ->
 676           {:ok, object}
 677
 678         _e ->
 679           Logger.info("Couldn't get object via AP, trying out OStatus fetching...")
 680
 681           case OStatus.fetch_activity_from_url(id) do
 682             {:ok, [activity | _]} -> {:ok, Object.get_by_ap_id(activity.data["object"]["id"])}
 683             e -> e
 684           end
 685       end
 686     end
 687   end
 688
 689   def is_public?(activity) do
 690     "https://www.w3.org/ns/activitystreams#Public" in (activity.data["to"] ++
 691                                                          (activity.data["cc"] || []))
 692   end
 693
 694   def visible_for_user?(activity, nil) do
 695     is_public?(activity)
 696   end
 697
 698   def visible_for_user?(activity, user) do
 699     x = [user.ap_id | user.following]
 700     y = activity.data["to"] ++ (activity.data["cc"] || [])
 701     visible_for_user?(activity, nil) || Enum.any?(x, &(&1 in y))
 702   end
 703 end